JP6396094B2 - Printing machine and ink temperature adjustment method - Google Patents

Description

  The present invention relates to a printing press and an ink temperature adjusting method, and more particularly to a printing press and an ink temperature adjusting method capable of stably producing a higher-quality print.

Conventionally, offset printing machines, flexographic printing machines, gravure printing machines, and the like are known as printing techniques.
In these printing machines, ink is continuously printed on a printing medium guided at high speed by an impression cylinder.

  By the way, in these printing machines, temperature control of ink is extremely important. That is, the viscosity of the ink changes due to the temperature change, and the amount of adhesion to the printing medium changes. Therefore, the temperature affects the quality of the printed body.

On the other hand, offset printers with temperature management have been developed.
For example, based on the temperature measured by the temperature measuring means for measuring the temperature in at least one place of the inking unit that supplies ink from the ink fountain to the plate cylinder, the cooling means for cooling the inking unit, and the temperature measured by the temperature measuring means. There are known a cooling control means for controlling the operation of the cooling means and an offset printing machine provided (for example, see Patent Documents 1 to 6).

Japanese Patent Application Laid-Open No. 08-281919 Japanese Patent Laid-Open No. 09-29934 JP 09-29935 A Japanese Patent Laid-Open No. 09-29936 JP 09-29937 A JP 09-29938 A

  However, although the offset printing machines described in Patent Documents 1 to 6 are provided with temperature measuring means for measuring the temperature of the inking unit, the temperature of the ink applied to the essential plate is not measured and managed. Not. For this reason, for example, when there is a difference between the temperature of the inking unit and the temperature of the ink on the surface of the plate cylinder, a high-quality print cannot be produced.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a printing machine and an ink temperature adjusting method capable of stably producing a higher-quality print.

  The present inventor has intensively studied to solve the above problems, and found that the above problems can be solved by permanently installing a first temperature measuring device for measuring the temperature of the ink on the surface of the plate cylinder. It came to complete.

The present invention includes (1) an ink supply unit for supplying ink, a plate cylinder to which the ink is applied through a roll group composed of a plurality of rolls, a blanket cylinder in contact with the plate cylinder, and the blanket An impression cylinder in contact with the cylinder, and a temperature controller having a function of heating and cooling the heat medium , the printing medium is guided by the impression cylinder, and the ink is printed from the plate cylinder through the blanket cylinder. In at least one of the roll groups in the printing machine to be transferred to the printer, a cylindrical horizontal runout roll having a hollow portion through which the heat medium can flow is provided, and the ink supply unit, the roll group, and the plate cylinder are accommodated by the housing. A first temperature measuring device for measuring the temperature of the ink on the surface of the plate cylinder, wherein an exhaust port is provided in the upper part of the housing, and internal air flows out or flows in through the exhaust port, and Side roll table A second temperature measuring device for measuring the temperature of the ink is permanently installed, the first temperature measuring device is attached to the side wall of the housing obliquely below the plate cylinder, and the second temperature measuring device is disposed obliquely below the side roll. In a printing press attached to the side wall of the housing.

The present invention, (2) the first temperature measuring device, the temperature of the ink on the surface of the plate cylinder, Ri first radiation type temperature measuring device Der be measured from a position at a predetermined distance, the second temperature measuring device , the temperature of the ink on the surface of the horizontal deflection rolls lies a fixed distance Ru second radiation type temperature measuring device der measured from positions at the (1) described printing machine.

This invention exists in the printing machine as described in said (1) or (2) which is ( 3 ) waterless offset printing machine.

The present invention is ( 4 ) a method for adjusting the temperature of ink using the printing press according to any one of (1) to (3 ) above, wherein the first temperature measuring device and the second temperature measuring device are used. Then, the temperature of the heat medium is adjusted by a temperature controller based on each temperature measured in the above, and the temperature of the ink is adjusted by heating or cooling the ink by circulating the heat medium through the hollow portion.
In the present invention, (5) the printing speed is higher than 1700 m / hour, and the temperature T1 measured by the first temperature measuring device is T1> with respect to the set temperature Tx. When Tx is reached, the heat medium is cooled by the temperature controller and is circulated through the horizontal shake roll, and the temperature T2 measured by the second temperature measuring device is controlled so that T2 ≦ Tx with respect to the set temperature Tx. If the temperature T1 measured by the first temperature measurement device is T1 <Tx with respect to the set temperature Tx, the printing medium is conveyed at a low speed of 1700 m / hour or less and printed. The above (4), wherein the heat medium is heated by the conditioner and is distributed to the horizontal shake roll, and the temperature T2 measured by the second temperature measuring device is controlled so that T2 ≧ Tx with respect to the set temperature Tx. Ink temperature control method.
In the present invention, (6) the temperature of the ink applied to the plate on the surface of the plate cylinder is a set temperature of 20 ° C. to 50 ° C., and the viscosity when the ink is used is 5 Pa · s to 1500 Pa · s. 4) or the temperature adjusting method for an ink according to (5).

According to the present invention, ( 7 ) a temperature signal is transmitted to the CPU unit, and the temperature of the heat medium is adjusted by the temperature controller based on the signal , to any one of the above (4) to (6) The present invention resides in the temperature adjusting method for ink described.

In the printing machine of the present invention, since the first temperature measuring device for measuring the temperature of the ink applied to the plate is permanently installed on the surface of the plate cylinder, it is closer to the ink immediately before being transferred to the printing medium, and The temperature of the ink applied to the plate can be measured.
And by measuring the temperature of the ink on the surface of the plate cylinder, it becomes possible to stably produce a high-quality print. Conventionally, since the temperature of the ink in the roll group was measured, for example, when the plate cylinder itself is heated, the temperature of the ink on the surface of the plate cylinder is different from the temperature of the ink in the roll group. However, in the present invention, since the temperature of the ink on the surface of the plate cylinder is directly measured, such a problem does not occur.

  In the printing press according to the present invention, the first temperature measuring device is a first radiation type temperature measuring device that measures the temperature of the ink on the surface of the plate cylinder from a position at a certain distance. There is an advantage that the maintenance of the trunk is easy to perform.

In the printing machine of the present invention, at least one of the roll groups is a cylindrical horizontal roll having a hollow portion, and a heat medium can flow through the hollow portion. It can be heated or cooled.
At this time, it is possible to alternately switch between heating of the ink and cooling of the ink by providing a temperature controller for heating or cooling the heat medium.

Incidentally, in a printing press, the temperature of the ink rises due to frictional heat by conveying the printing medium at high speed. Therefore, in a conventional printing machine, a cooling device is provided to lower the temperature of the ink.
On the other hand, since the printing press of the present invention includes a temperature controller that can also be heated, it is possible to positively transport and print the printing medium at a low speed. That is, when the printing medium is transported at a low speed, the temperature of the ink is lowered, but it is possible to make the temperature constant by heating the ink with a temperature controller.

The printing press of the present invention can measure the temperature of the ink before the ink reaches the plate cylinder when the second temperature measuring device for measuring the temperature of the ink on the surface of the roll is further installed. It is possible to prevent the ink temperature from fluctuating suddenly on the surface of the cylinder.
Further, the second temperature measuring device can be made fail-safe when the first temperature measuring device fails.

  In the printing machine of the present invention, the second temperature measuring device is a second radiation type temperature measuring device that measures the temperature of the ink on the surface of the horizontal roll from a position at a certain distance, so it does not get in the way, There is an advantage that the roll group can be easily maintained.

  When the printing press of the present invention is a waterless offset printing press, it is more effective because the viscosity of the ink is likely to change due to a temperature change.

In the ink temperature adjustment method of the present invention, since the ink is heated or cooled based on the temperature measured using the first temperature measuring device using the above-mentioned printing press, a high-quality printed body can be stably produced. It can be manufactured.
For example, the ink can be heated or cooled in the roll group by adjusting the temperature of the heat medium with a temperature controller and circulating the heat medium in the hollow portion.
In addition, since the temperature of the ink can be known before the ink reaches the plate cylinder by measuring and controlling the temperature using the first temperature measuring device and the second temperature measuring device, the ink on the surface of the plate cylinder It is possible to prevent a situation in which the temperature of the battery fluctuates suddenly.

In the ink temperature adjustment method of the present invention, a temperature signal is transmitted to the CPU unit, and the temperature of the heat medium is adjusted by the temperature controller based on the signal, so that the temperature can be adjusted quickly and efficiently. It can be carried out.
Further, since the temperature signal information with time can be accumulated in the CPU unit, it is possible to predict the timing of temperature adjustment by analyzing the signal information.

FIG. 1 is a schematic side view showing a printing press according to the present embodiment. FIG. 2 is a perspective view showing a lateral roll of the printing press according to the present embodiment. FIG. 3 is an explanatory diagram for explaining an ink adjustment method according to the present embodiment.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings as necessary. In the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. Further, the positional relationship such as up, down, left and right is based on the positional relationship shown in the drawings unless otherwise specified. Further, the dimensional ratios in the drawings are not limited to the illustrated ratios.

  An example of a waterless offset printing machine is shown as this embodiment of the printing machine according to the present invention. In addition, since the waterless offset printing machine does not use water, the viscosity of the ink is easily affected by a temperature change.

FIG. 1 is a schematic side view showing a part of the printing press according to the present embodiment.
As shown in FIG. 1, the printing press 100 includes an ink supply unit 10 that supplies ink, a plate cylinder 20 to which the ink is applied via a roll group Q composed of a plurality of rolls, and the plate cylinder 20. The blanket cylinder 30 is in contact with the pressure cylinder 40 and is in contact with the blanket cylinder 30.

In the printing machine 100, a printing medium (not shown) is guided by the impression cylinder 40, and ink is transferred from the printing cylinder 20 to the printing medium via the blanket cylinder 30.
And after a to-be-printed body is transcribe | transferred, ink is hardened by well-known post-processing, and a printed body is obtained.

Here, the material to be printed is not particularly limited, and examples thereof include non-water-absorbing synthetic paper, cardboard, cloth, plastic film, or plastic plate.
The ink is not particularly limited, and known inks such as oil-based inks, water-based inks, and ultraviolet curable inks are appropriately used.
In addition, when using oil-based ink and water-based ink as ink, heat drying is performed as a post-processing, and when using an ultraviolet curable ink, ultraviolet irradiation is performed.

In the printing press 100, the ink supply unit 10, the roll group Q, and the plate cylinder 20 are accommodated in a housing 50.
Further, an exhaust port is provided in the upper part 50a of the housing 50, and internal air flows out or flows in through the exhaust port.

The ink supply unit 10 includes an ink tank (not shown) and a take-out roll 10a that takes out ink from the ink tank.
In the printing press 100, the ink is taken out by the take-out roll 10a from the ink tank supplemented with ink, and supplied to the roll group Q from the take-out roll 10a.

In the roll group Q, the rolls are adjacent to each other, and the ink applied to the surface of one roll moves to the surface of the other roll by rotating together.
Then, by repeating this, the ink is sequentially transferred from the roll adjacent to the ink supply unit 10 to the other rolls, and reaches the plate cylinder 20.

Here, at least one of the roll groups Q is a lateral roll 11.
FIG. 2 is a perspective view showing a lateral roll of the printing press according to the present embodiment.
As shown in FIG. 2, the horizontal runout roll 11 has a cylindrical shape having a hollow portion 11 a.
In addition, a heat medium can flow through the hollow portion 11a. That is, by causing the heat medium to flow through the hollow portion 11a, the horizontal shake roll 11 can be heated or cooled, and thereby the ink applied to the surface of the horizontal shake roll 11 can be heated or cooled. It has become.

Returning to FIG. 1, in the printing press 100 according to the present embodiment, a second temperature measuring device 52 that measures the temperature of the ink on the surface of the horizontal shake roll 11 is attached to the side wall of the housing 50.
That is, in the printing press 100, the second temperature measuring device 52 is permanently installed.
For this reason, since the temperature of the ink can be measured before the ink reaches the plate cylinder 20, it is possible to prevent a situation in which the temperature of the ink suddenly fluctuates on the surface of the plate cylinder 20.

Here, the second temperature measuring device 52 is a second radiation type temperature measuring device that measures the temperature of the ink on the surface of the horizontal shake roll 11 from a position at a certain distance.
The second temperature measuring device 52 is attached obliquely below the horizontal shake roll 11 so that the adjacent rolls do not interfere when measuring the temperature of the surface of the horizontal shake roll 11.
In addition, since the 2nd temperature measurement apparatus 52 is attached to the horizontal downward roll 11 diagonally below, there also exists an advantage that it does not become obstructive at the time of the maintenance of the roll group Q, etc.

The plate cylinder 20 has a plate formed on the surface thereof, and ink is applied to the plate from the roll group Q.
Examples of such plate types include intaglio and letterpress.
Then, the ink applied to the plate is transferred to the printing medium sandwiched between the blanket cylinder 30 and the impression cylinder 40 via the blanket cylinder 30 in contact with the plate cylinder 20.

In the printing press 100 according to the present embodiment, a first temperature measuring device 51 that measures the temperature of ink on the surface of the plate cylinder 20 is attached to the side wall of the housing 50.
That is, in the printing press 100, the first temperature measuring device 51 is permanently installed.
For this reason, since it is closer to the ink immediately before being transferred to the printing medium and the temperature of the ink applied to the plate can be measured, it is possible to stably produce a high-quality printing body.

Here, the first temperature measuring device 51 is a first radiation type temperature measuring device that measures the temperature of the ink on the surface of the plate cylinder 20 from a position at a certain distance.
The first temperature measuring device 51 is attached obliquely below the plate cylinder 20 so that adjacent rolls do not interfere when measuring the temperature of the surface of the plate cylinder 20.
Since the first temperature measuring device 51 is attached obliquely below the plate cylinder 20, there is also an advantage that it does not get in the way during maintenance of the plate cylinder 20.

Next, an ink temperature adjusting method will be described.
The printing machine 100 includes a temperature controller (not shown) that heats or cools the heat medium.
The heat medium is not particularly limited, and examples thereof include water (such as antifreeze liquid), gas, oil, and other fluids.

FIG. 3 is an explanatory diagram for explaining an ink adjustment method according to the present embodiment.
As shown in FIG. 3, the ink adjustment method according to the present embodiment is measured using the temperature of the ink on the surface of the plate cylinder 20 measured using the first temperature measuring device 51 and the second temperature measuring device 52. A signal of the temperature of the ink on the surface of the horizontal shake roll 11 is transmitted to the CPU unit 81 of the computer, and the temperature of the heat medium is adjusted by the temperature controller 80 based on the signal.
The temperature controller 80 can heat or cool the heat medium, and cools the heat medium when the temperature in the signal is high and heats the heat medium when the temperature is low.
And the heat medium in which the temperature was adjusted is distribute | circulated to the hollow part 11a of the horizontal shake roll 11 mentioned above, and, thereby, heating or cooling of ink is performed.

For example, when the printing medium is conveyed and printed at a speed higher than the traveling speed of 1700 m / hour, the temperature of the ink tends to increase due to the frictional heat of each roll.
In this case, the temperature T1 measured by the first temperature measuring device 51 and the set temperature Tx are
T1> Tx
Therefore, the heat medium is cooled by the temperature controller 80 and is circulated through the horizontal shake roll 11.
At this time, the temperature T2 measured by the second temperature measuring device 52 and the set temperature Tx are
T2 ≦ Tx
Control to be

On the other hand, when the printing medium is printed while being conveyed at a low speed of 1700 m / hour or less, the heat of friction is small, so the temperature of the ink is low and the temperature does not rise to the set temperature.
In this case, the temperature T1 measured by the first temperature measuring device 51 and the set temperature Tx are
T1 <Tx
Therefore, the heat medium is heated by the temperature controller 80 and is circulated through the horizontal shake roll 11.
At this time, the temperature T2 measured by the second temperature measuring device 52 and the set temperature Tx are
T2 ≧ Tx
Control to be
By such an ink temperature adjusting method, the optimum ink temperature is always maintained.

In addition, it is preferable to adjust the temperature of the ink provided to the plate so that the set temperature is 20 ° C to 50 ° C.
Further, the viscosity at the time of using the ink is preferably 5 Pa · s to 1500 Pa · s.

In the ink temperature adjustment method according to the present embodiment, since the ink is heated or cooled based on the respective temperatures measured using the first temperature measuring device 51 and the second temperature measuring device 52, high quality is achieved. It becomes possible to produce a printed body stably.
In addition, since a temperature signal is transmitted to the CPU unit 81 and the temperature of the heat medium is adjusted by the temperature controller 80 based on the signal, the temperature can be adjusted quickly and efficiently.
And since the temperature signal information with time can be accumulated in the CPU unit 81, the adjustment of the temperature can be managed in a timely manner by analyzing the signal information.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment.

For example, as an embodiment of the printing press according to the present invention, an example of a waterless offset printing press (printing machine 100) is shown, but it can also be adopted in a water offset printing press.
Similarly, it can be employed in a flexographic printing machine, a gravure printing machine, and the like that print using a plate.

In the printing press 100 according to the present embodiment, the roll group Q shows one lateral shake roll 11 capable of circulating a heat medium (temperature adjustable) (see FIG. 1), but the roll group Q is the same. You may have two or more side rolls of the structure.
In this case, it is preferable that a temperature measuring device corresponding to each lateral roll is attached to the housing 50 and managed by measuring the temperature of the surface of each lateral roll.

  The printing press 100 according to the present embodiment includes the first temperature measuring device 51 and the second temperature measuring device 52, but the second temperature measuring device 52 is not necessarily provided.

On the other hand, the printing press 100 according to the present embodiment includes the first temperature measuring device 51 and the second temperature measuring device 52, but may further include a temperature measuring device. In this case, it is preferable to set the temperature setting at which the temperature controller heats or cools in multiple stages according to the number of temperature measuring devices.
For example, the temperature conditions may be adjusted according to the number of temperature measuring devices in which an abnormality has occurred in temperature.

  In the present invention, the printing machine is used as a printing machine that transfers ink to a printing medium. According to the printing machine of the present invention, it is possible to stably produce a higher-quality print.

DESCRIPTION OF SYMBOLS 10 ... Ink supply part 10a ... Taking-out roll 11 ... Side roll 11a ... Hollow part 20 ... Plate cylinder 30 ... Blanket cylinder 40 ... Impression cylinder 50 ... Housing 50a ... Upper part 51 ... First temperature measuring device 52 ... Second temperature measuring device 80 ... Temperature controller 81 ... CPU unit 100 ... Printing machine Q ... Roll group

Claims (7)

An ink supply section for supplying ink, a plate cylinder to which the ink is applied via a roll group composed of a plurality of rolls, a blanket cylinder in contact with the plate cylinder, and a pressure in contact with the blanket cylinder A cylinder and a temperature controller having a function of heating and cooling the heat medium , the printing medium is guided by the impression cylinder, and the ink is transferred from the plate cylinder to the printing medium through the blanket cylinder. In the printing press
At least one of the roll groups is a cylindrical lateral roll having a hollow portion through which the heat medium can flow.
The ink supply unit, the roll group, and the plate cylinder are accommodated by a housing,
An exhaust port is provided in the upper part of the housing, and internal air flows out or flows in through the exhaust port,
A first temperature measuring device for measuring the temperature of the ink on the surface of the plate cylinder, and a second temperature measuring device for measuring the temperature of the ink on the surface of the run-out roll are permanently installed;
The first temperature measuring device is attached to a side wall of the housing obliquely below the plate cylinder;
The printing machine in which the second temperature measuring device is attached to a side wall of the housing obliquely below the side roll. The first temperature measuring device is a first radiation type temperature measuring device that measures the temperature of ink on the surface of the plate cylinder from a position at a certain distance,
2. The printing press according to claim 1, wherein the second temperature measuring device is a second radiation type temperature measuring device that measures the temperature of the ink on the surface of the horizontal roll from a position at a predetermined distance.   The printing press according to claim 1 or 2, which is a waterless offset printing press. An ink temperature adjustment method using the printing machine according to any one of claims 1 to 3,
Based on the respective temperatures measured using the first temperature measuring device and the second temperature measuring device, the temperature of the heat medium is adjusted by the temperature controller, and the heat medium is circulated through the hollow portion. The temperature adjustment method of the ink which heats or cools the ink. When the printing speed is transported and printed at a speed higher than 1700 m / hour, and the temperature T1 measured by the first temperature measurement device satisfies T1> Tx with respect to the set temperature Tx, Cooling the heat medium with a temperature controller, circulating the heat medium through the roll, and controlling the temperature T2 measured by the second temperature measuring device so that T2 ≦ Tx with respect to the set temperature Tx,
When the printing medium is printed while being transported at a low speed of 1700 m / hour or less, and the temperature T1 measured by the first temperature measuring device satisfies T1 <Tx with respect to the set temperature Tx,
A heating medium is heated by the temperature controller and is distributed to the lateral shake roll, and the temperature T2 measured by the second temperature measuring device is controlled so that T2 ≧ Tx with respect to the set temperature Tx. Item 5. The method for adjusting the temperature of the ink according to Item 4. The temperature of the ink applied to the plate on the surface of the plate cylinder is a set temperature of 20 ° C to 50 ° C, and the viscosity when the ink is used is 5 Pa · s to 1500 Pa · s. Ink temperature adjustment method. The ink temperature adjustment method according to claim 4, wherein the temperature signal is transmitted to a CPU unit, and the temperature of the heat medium is adjusted by the temperature controller based on the signal.

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